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schannel: add client certificate authentication

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Users can now specify a client certificate in system certificates store
explicitly using expression like `--cert "CurrentUser\MY\<thumbprint>"`

Closes #2376
This commit is contained in:
Archangel_SDY 2018-03-10 23:40:00 +08:00 committed by Daniel Stenberg
parent bc4b8c9717
commit e35b0256eb
No known key found for this signature in database
GPG Key ID: 5CC908FDB71E12C2
2 changed files with 123 additions and 1 deletions
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3
docs/libcurl/opts/CURLOPT_SSLCERT.3
View File

@ -38,6 +38,9 @@ you wish to authenticate with as it is named in the security database. If you
want to use a file from the current directory, please precede it with "./"
prefix, in order to avoid confusion with a nickname.
With WinSSL, this can be expression like "CurrentUser\\MY\\<thumbprint>" to
refer to a certificate in the system certificates store.
When using a client certificate, you most likely also need to provide a
private key with \fICURLOPT_SSLKEY(3)\fP.

119
lib/vtls/schannel.c
View File

@ -92,6 +92,12 @@
#endif
#endif
#ifdef UNICODE
#define CURL_CERT_STORE_PROV_SYSTEM CERT_STORE_PROV_SYSTEM_W
#else
#define CURL_CERT_STORE_PROV_SYSTEM CERT_STORE_PROV_SYSTEM_A
#endif
#ifndef SP_PROT_SSL2_CLIENT
#define SP_PROT_SSL2_CLIENT 0x00000008
#endif
@ -124,6 +130,9 @@
#define CURL_SCHANNEL_BUFFER_INIT_SIZE 4096
#define CURL_SCHANNEL_BUFFER_FREE_SIZE 1024
#define CERT_THUMBPRINT_STR_LEN 40
#define CERT_THUMBPRINT_DATA_LEN 20
/* Uncomment to force verbose output
* #define infof(x, y, ...) printf(y, __VA_ARGS__)
* #define failf(x, y, ...) printf(y, __VA_ARGS__)
@ -227,6 +236,56 @@ set_ssl_version_min_max(SCHANNEL_CRED *schannel_cred, struct connectdata *conn)
return CURLE_OK;
}
static CURLcode
get_cert_location(TCHAR *path, DWORD *store_name, TCHAR **store_path,
TCHAR **thumbprint)
{
TCHAR *sep;
size_t store_name_len;
sep = _tcschr(path, TEXT('\\'));
if(sep == NULL)
return CURLE_SSL_CONNECT_ERROR;
store_name_len = sep - path;
if(_tcsnccmp(path, TEXT("CurrentUser"), store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_CURRENT_USER;
else if(_tcsnccmp(path, TEXT("LocalMachine"), store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_LOCAL_MACHINE;
else if(_tcsnccmp(path, TEXT("CurrentService"), store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_CURRENT_SERVICE;
else if(_tcsnccmp(path, TEXT("Services"), store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_SERVICES;
else if(_tcsnccmp(path, TEXT("Users"), store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_USERS;
else if(_tcsnccmp(path, TEXT("CurrentUserGroupPolicy"),
store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_CURRENT_USER_GROUP_POLICY;
else if(_tcsnccmp(path, TEXT("LocalMachineGroupPolicy"),
store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_LOCAL_MACHINE_GROUP_POLICY;
else if(_tcsnccmp(path, TEXT("LocalMachineEnterprise"),
store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_LOCAL_MACHINE_ENTERPRISE;
else
return CURLE_SSL_CONNECT_ERROR;
*store_path = sep + 1;
sep = _tcschr(*store_path, TEXT('\\'));
if(sep == NULL)
return CURLE_SSL_CONNECT_ERROR;
*sep = 0;
*thumbprint = sep + 1;
if(_tcslen(*thumbprint) != CERT_THUMBPRINT_STR_LEN)
return CURLE_SSL_CONNECT_ERROR;
return CURLE_OK;
}
static CURLcode
schannel_connect_step1(struct connectdata *conn, int sockindex)
{
@ -241,6 +300,7 @@ schannel_connect_step1(struct connectdata *conn, int sockindex)
unsigned char alpn_buffer[128];
#endif
SCHANNEL_CRED schannel_cred;
PCCERT_CONTEXT client_certs[1] = { NULL };
SECURITY_STATUS sspi_status = SEC_E_OK;
struct curl_schannel_cred *old_cred = NULL;
struct in_addr addr;
@ -361,11 +421,67 @@ schannel_connect_step1(struct connectdata *conn, int sockindex)
return CURLE_SSL_CONNECT_ERROR;
}
/* client certificate */
if(data->set.ssl.cert) {
DWORD cert_store_name;
TCHAR *cert_store_path;
TCHAR *cert_thumbprint_str;
CRYPT_HASH_BLOB cert_thumbprint;
BYTE cert_thumbprint_data[CERT_THUMBPRINT_DATA_LEN];
HCERTSTORE cert_store;
TCHAR *cert_path = Curl_convert_UTF8_to_tchar(data->set.ssl.cert);
if(!cert_path)
return CURLE_OUT_OF_MEMORY;
result = get_cert_location(cert_path, &cert_store_name,
&cert_store_path, &cert_thumbprint_str);
if(result != CURLE_OK) {
Curl_unicodefree(cert_path);
return result;
}
cert_store = CertOpenStore(CURL_CERT_STORE_PROV_SYSTEM, 0, NULL,
cert_store_name, cert_store_path);
if(!cert_store) {
Curl_unicodefree(cert_path);
return CURLE_SSL_CONNECT_ERROR;
}
cert_thumbprint.pbData = cert_thumbprint_data;
cert_thumbprint.cbData = CERT_THUMBPRINT_DATA_LEN;
if(!CryptStringToBinary(cert_thumbprint_str, CERT_THUMBPRINT_STR_LEN,
CRYPT_STRING_HEXRAW,
cert_thumbprint_data, &cert_thumbprint.cbData,
NULL, NULL)) {
Curl_unicodefree(cert_path);
return CURLE_SSL_CONNECT_ERROR;
}
client_certs[0] = CertFindCertificateInStore(
cert_store, X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, 0,
CERT_FIND_HASH, &cert_thumbprint, NULL);
Curl_unicodefree(cert_path);
if(client_certs[0]) {
schannel_cred.cCreds = 1;
schannel_cred.paCred = client_certs;
}
CertCloseStore(cert_store, 0);
}
/* allocate memory for the re-usable credential handle */
BACKEND->cred = (struct curl_schannel_cred *)
calloc(1, sizeof(struct curl_schannel_cred));
if(!BACKEND->cred) {
failf(data, "schannel: unable to allocate memory");
if(client_certs[0])
CertFreeCertificateContext(client_certs[0]);
return CURLE_OUT_OF_MEMORY;
}
BACKEND->cred->refcount = 1;
@ -379,6 +495,9 @@ schannel_connect_step1(struct connectdata *conn, int sockindex)
&BACKEND->cred->cred_handle,
&BACKEND->cred->time_stamp);
if(client_certs[0])
CertFreeCertificateContext(client_certs[0]);
if(sspi_status != SEC_E_OK) {
if(sspi_status == SEC_E_WRONG_PRINCIPAL)
failf(data, "schannel: SNI or certificate check failed: %s",